i.mx6 boardbring up

we are working on i.mx6 customized board which has just come after assembly. we were trying to port OS into it by deploying the SD card image, Uboot etc as explained in the Yocto project.

but when we are powering on the board by putting sd card into the board. nothing is appearing on the monitor which is connected to board through HDMI.

in order to check the correctness and validate our design, we also got evaluation board wandboard quad, for which we have deployed respective image to sd card and powered on the board by putting sd card. then display is coming on the monitor.

So, this has confirmed that we are missing something in our board. while designing the board we taken the references from wand board and as well as sabrelite.

for example, we have taken sd card and other peripheral connections ,schematic and made connections based on wandboard and for some other systems like hdmi, csi we have considered sabrelite reference deisgns.

now, our query is:

Yocto project is specifying procedure deploying the image files to sd card for particular architecture. But, can we create image files files for customized boards (like our case which is mixture of both wand board and sabrelite). How can we do that.